Cheap Flights from Denver International to Seattle

Compare Denver International to Seattle flight deals

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Flight deals from Denver International Airport to Seattle

Looking for a cheap last-minute deal or the best return flight from Denver International Airport to Seattle? If you want to travel next month, return fares start from $180. Find the lowest prices on one-way and return tickets right here.

Seattle.$180 per passenger.Departing Tue, 28 Apr, returning Wed, 6 May.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Denver International on Tue, 28 Apr, arriving in Seattle / Tacoma International.Inbound direct flight with Frontier Airlines departs from Seattle / Tacoma International on Wed, 6 May, arriving in Denver International.Price includes taxes and charges.From $180, select.

Seattle.$180 per passenger.Departing Wed, 13 May, returning Tue, 19 May.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Denver International on Wed, 13 May, arriving in Seattle / Tacoma International.Inbound direct flight with Frontier Airlines departs from Seattle / Tacoma International on Tue, 19 May, arriving in Denver International.Price includes taxes and charges.From $180, select.

Seattle.$190 per passenger.Departing Tue, 28 Apr, returning Wed, 29 Apr.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Denver International on Tue, 28 Apr, arriving in Seattle / Tacoma International.Inbound indirect flight with Frontier Airlines, departs from Seattle / Tacoma International on Wed, 29 Apr, arriving in Denver International.Price includes taxes and charges.From $190, select.

Seattle.$206 per passenger.Departing Sat, 25 Apr, returning Sun, 26 Apr.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Denver International on Sat, 25 Apr, arriving in Seattle / Tacoma International.Inbound direct flight with Frontier Airlines departs from Seattle / Tacoma International on Sun, 26 Apr, arriving in Denver International.Price includes taxes and charges.From $206, select.

Seattle.$222 per passenger.Departing Tue, 9 Jun, returning Wed, 24 Jun.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Denver International on Tue, 9 Jun, arriving in Seattle / Tacoma International.Inbound direct flight with Frontier Airlines departs from Seattle / Tacoma International on Wed, 24 Jun, arriving in Denver International.Price includes taxes and charges.From $222, select.

Seattle.$287 per passenger.Departing Wed, 27 May, returning Mon, 8 Jun.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Denver International on Wed, 27 May, arriving in Seattle / Tacoma International.Inbound indirect flight with Frontier Airlines, departs from Seattle / Tacoma International on Mon, 8 Jun, arriving in Denver International.Price includes taxes and charges.From $287, select.

Seattle.$307 per passenger.Departing Tue, 30 Jun, returning Tue, 7 Jul.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Denver International on Tue, 30 Jun, arriving in Seattle / Tacoma International.Inbound direct flight with Frontier Airlines departs from Seattle / Tacoma International on Tue, 7 Jul, arriving in Denver International.Price includes taxes and charges.From $307, select.

Seattle.$310 per passenger.Departing Sun, 10 May, returning Mon, 15 Jun.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Denver International on Sun, 10 May, arriving in Seattle / Tacoma International.Inbound direct flight with Frontier Airlines departs from Seattle / Tacoma International on Mon, 15 Jun, arriving in Denver International.Price includes taxes and charges.From $310, select.

Seattle.$323 per passenger.Departing Sat, 1 Aug, returning Wed, 12 Aug.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Denver International on Sat, 1 Aug, arriving in Seattle / Tacoma International.Inbound direct flight with Frontier Airlines departs from Seattle / Tacoma International on Wed, 12 Aug, arriving in Denver International.Price includes taxes and charges.From $323, select.

Seattle.$343 per passenger.Departing Wed, 22 Jul, returning Tue, 28 Jul.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Denver International on Wed, 22 Jul, arriving in Seattle / Tacoma International.Inbound indirect flight with Frontier Airlines, departs from Seattle / Tacoma International on Tue, 28 Jul, arriving in Denver International.Price includes taxes and charges.From $343, select.

Seattle.$357 per passenger.Departing Wed, 15 Jul, returning Thu, 23 Jul.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Denver International on Wed, 15 Jul, arriving in Seattle / Tacoma International.Inbound direct flight with Frontier Airlines departs from Seattle / Tacoma International on Thu, 23 Jul, arriving in Denver International.Price includes taxes and charges.From $357, select.

Seattle.$359 per passenger.Departing Fri, 31 Jul, returning Sat, 8 Aug.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Denver International on Fri, 31 Jul, arriving in Seattle / Tacoma International.Inbound direct flight with Frontier Airlines departs from Seattle / Tacoma International on Sat, 8 Aug, arriving in Denver International.Price includes taxes and charges.From $359, select.

Seattle.$413 per passenger.Departing Fri, 15 May, returning Tue, 28 Jul.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Denver International on Fri, 15 May, arriving in Seattle / Tacoma International.Inbound indirect flight with Frontier Airlines, departs from Seattle / Tacoma International on Tue, 28 Jul, arriving in Denver International.Price includes taxes and charges.From $413, select.

Seattle.$496 per passenger.Departing Fri, 15 May, returning Tue, 28 Jul.Return flight with Delta.Outbound direct flight with Delta departs from Denver International on Fri, 15 May, arriving in Seattle / Tacoma International.Inbound direct flight with Delta departs from Seattle / Tacoma International on Tue, 28 Jul, arriving in Denver International.Price includes taxes and charges.From $496, select.

Seattle.$511 per passenger.Departing Sat, 29 Aug, returning Tue, 1 Sep.Return flight with Delta.Outbound direct flight with Delta departs from Denver International on Sat, 29 Aug, arriving in Seattle / Tacoma International.Inbound direct flight with Delta departs from Seattle / Tacoma International on Tue, 1 Sep, arriving in Denver International.Price includes taxes and charges.From $511, select.

Seattle.$516 per passenger.Departing Wed, 2 Sep, returning Wed, 9 Sep.Return flight with Delta.Outbound direct flight with Delta departs from Denver International on Wed, 2 Sep, arriving in Seattle / Tacoma International.Inbound direct flight with Delta departs from Seattle / Tacoma International on Wed, 9 Sep, arriving in Denver International.Price includes taxes and charges.From $516, select.

Find the cheapest month to fly from Denver International to Seattle

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Denver International to Seattle flights are currently cheapest in May.

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Direct flights from Denver International to Seattle

Alternative Denver International to Seattle routes

Looking for the cheapest, fastest or easiest route from Denver International to Seattle? You could fly into the following airports instead.

Denver to Seattle: Flight information

The things to know before you go.

Cheapest flight found	$77
Cheapest month to fly	April
Average flight time	3 hrs, 3 mins
Most popular airline	Alaska Airlines
Average flights per week	301

Finding cheap flights from Denver International to Seattle: Frequently asked questions

How many airports are there in Seattle?

There are 4 airports in Seattle: Seattle Lake Union SPB, Seattle Boeing Fld, Seattle / Tacoma International, and Paine Field.

How much are return flights from Denver International to Seattle?

The best price we found for a return flight from Denver International to Seattle is $180. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.

How long does it take to fly from Denver International to Seattle?

3 hours and 3 minutes is the average flight time from Denver International to Seattle.

Which airlines fly direct from Denver International to Seattle?

Alaska Airlines, Southwest Airlines and WestJet fly direct from Denver International to Seattle.

How many flights are there a week from Denver International to Seattle?

As of April 2026, there are 301 flights per week flying from Denver International to Seattle.

When is the cheapest time to fly from Denver International to Seattle?

The cheapest month to fly from Denver International to Seattle is usually April.

Which is the cheapest airport to fly into in Seattle?

If you're flying from Denver International Airport, the cheapest airport near Seattle is Seattle / Tacoma International – which is 19.5 km away from the centre of Seattle. We've found flights into this airport from $180.

Which upcoming date is cheapest to fly from Denver International Airport to Seattle on?

After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Denver International Airport to Seattle on Tuesday, 28 April 2026.

Can I get a direct flight from Denver International Airport to Seattle?

Yes – the average flight time is 3 hours and 3 minutes.

How can I get the best flight deal from Denver International Airport to Seattle?

We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Seattle but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.

When is the best time to book flights to Seattle?

We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Seattle is around 40 days in advance, so don’t leave your flight to the last minute.

What’s the weather like in Seattle?

In April, the average temperature is usually around 8°C. August is typically the warmest month in Seattle, when it usually averages around 23°C. You can expect the least rain in July. The coldest month is December, with temperatures averaging 0°C. The rainiest month is November.

Which is the cheapest airline to fly from Denver International Airport to Seattle with?

Currently, Frontier Airlines offers the cheapest flight tickets to Seattle.

Travelling from Denver International Airport (DEN) to Seattle: what you need to know

Expect to be travelling for 2 hours 45 minutes. That's the average journey time for a direct flight from Denver International Airport to Seattle.
The timezone in Seattle is UTC-8. The city is one hour behind Denver, where Denver International Airport is located.
With 108 flights a week between the two airports, Denver International Airport (DEN) to Seattle-Tacoma International Airport (SEA) is the busiest route. Alaska Airlines operates the earliest flight at 06:00. If you're eager to get more out of your day before jetting off, the last flight from DEN to SEA is with Southwest Airlines at 22:50.
Give yourself plenty of time to catch your DEN to Seattle flight. Generally, it's best to arrive at least two hours before international departures and an hour ahead for domestic flights.
You can expect bigger queues during popular months like July. Arriving up to four hours in advance for an international flight and two hours for a domestic departure is a smart move.
You can book a direct Denver International Airport to Seattle ticket. Begin your journey at DEN and touch down at Seattle-Tacoma International Airport (SEA).
Direct flights from Denver International Airport to Seattle are available from a good range of airlines. Book your journey with one of these:
DEN is around 31 kilometres from central Denver. If you're ride-sharing, driving or catching a taxi from the centre, it'll take you 35 minutes or so to get there, depending on the traffic. If you're taking public transport, expect the trip time to be around 35 minutes.
Booking a hotel room for the night can take the hassle out of arriving at the airport on time. If you're searching for a place to stay before your flight from Denver International Airport to Seattle, consider The Westin Denver International Airport. It's a short drive from DEN.
Denver International Airport scores top marks for its on-time performance. 80% of flights that depart DEN arrive at their destination on time.
DEN is located at 8500 Pena Boulevard.

How to find the cheapest flights from Denver International Airport (DEN) to Seattle

The lowest price we've seen for a one-way Denver International Airport to Seattle flight is $77. The cheapest price for a return flight is $180. Remember fares may change due to availability at the time of booking.
Booking early is often the key to scoring a cheap flight from DEN to Seattle. Prices tend to rise as demand increases, so the closer you get to departure, the more you'll likely spend.
The 'Whole month' search tool will show you the cheapest tickets from Denver International Airport to Seattle across every month. It's a good way to snap up a bargain if your plans aren't set in stone.
Snapping up a cheap flight from DEN to Seattle is easy with Price Alerts. Simply create one of these automatic notifications and we'll notify you as soon as the price has dropped.
Pick your preferred arrival and departure times, number of stops and airlines with our filters. Then, sort the results for your flight from Denver International Airport to Seattle by 'Fastest,' 'Best' or 'Cheapest.'

Airports in Seattle

Seattle-Tacoma International Airport (SEA)

Seattle-Tacoma International Airport (SEA) to central Seattle takes around 25 minutes to reach by car. The centre is roughly 23 kilometres away.
When travelling by public transport, expect a journey time of around 35 minutes.
Book a hotel close to SEA if you have a late flight from Denver International Airport to Seattle. Settle into one of these accommodation options and make your first night all about rest:
Lock in the best deal by reserving your vehicle from Seattle-Tacoma International Airport around one week before your flight from DEN to Seattle.

Seattle Paine Field International Airport (PAE)

The centre of Seattle is about 40 kilometres from Seattle Paine Field International Airport (PAE). After your flight from Denver International Airport to Seattle has touched down and you've navigated your way to arrivals, the drive should take about 40 minutes.
If you travel by public transport, the ride to the centre will take you 1 hour 30 minutes or so.
After stepping off your DEN to Seattle flight, kick back at a hotel close to PAE. These are some comfortable accommodation options that'll help you get into relaxation mode:
Generally, the earlier you book, the better the prices and vehicle selection. Secure your ride from PAE as soon as you've confirmed your plans.

King County International Airport (BFI)

Make tracks for the city centre after your flight from Denver International Airport to Seattle has touched down. Central Seattle is around 11 kilometres from King County International Airport (BFI) and takes roughly 20 minutes to reach by taxi or ride-share.
If you travel by public transport, expect a journey of around 35 minutes.
If you don't want to make your way to the centre, find a hotel close to BFI. Get settled at one of these options after your DEN to Seattle flight:
If you're looking for a specific kind of vehicle, booking early increases your chances of getting what you want. Book your ride from BFI at least a couple of weeks ahead of your flight from Denver International Airport to Seattle.

Best time to go to Seattle

July is the most popular month for flights from Denver International Airport to Seattle. To avoid the crowds, head to Seattle in December.
Lock in a Denver International Airport to Seattle plane ticket with a departure in August if you want to experience the city during its warmest month. You can expect temperatures to range from 12ºC to 28ºC.
Search for cheap tickets from DEN to Seattle in February if you'd rather travel when it's cooler. Temperatures are at their lowest then, ranging between -1ºC and 11ºC on average.

More about Seattle

Start your Seattle trip off on the right foot by choosing the perfect place to stay. After booking your flight from Denver International Airport to Seattle, explore our selection of hotels including:
There are so many things to see and do in this city it can be hard to figure out where to begin. Pike Place Market, Space Needle and Seattle Skyline are major attractions which should feature on every Seattle itinerary.

Explore more of the United States

You've visited Seattle, now it's time to discover more of the United States. Journey about 241 kilometres south to Portland to check off its leading attractions. From Portland Japanese Garden to Peninsula Park Rose Garden and Beyond Van Gogh Portland, there's plenty to keep you on the go.
Spokane is another must-experience destination in the United States and is around 370 kilometres east of Seattle. No journey is complete without experiencing Riverside State Park, Spokane Falls (Upper Falls) and Cathedral of Our Lady of Lourdes.